| ITF Belgium F7 Qual | 2015/07/19 08:30 | Gijs Buntsma v Hunter Johnson | 6-4,4-6,1-6 |
| ITF Netherlands F4 | 2015/07/05 10:00 | Oliver Anderson v Gijs Buntsma | 6-2,6-1 |
| ITF Netherlands F2 Qual | 2015/06/21 09:00 | Jelle Sels v Gijs Buntsma | 7-6,6-2 |
| ITF Netherlands F1 Qual | 2015/06/13 08:30 | Gijs Buntsma v Marc Dijkhuizen | 1-6,6-7 |
| ITF Portugal F3 Qual | 2015/03/07 10:00 | Gijs Buntsma v Santiago Plaza | 4-6,0-6 |
| ITF Spain F2 | 2015/02/01 11:30 | Goncalo Oliveira v Gijs Buntsma | 6-1,6-1 |
| ITF Netherlands F6 | 2014/08/23 08:00 | Gijs Buntsma v Johann Willems | 2-6,1-6 |
| ITF Netherlands F2 Qual | 2014/06/15 08:00 | Sander Arends v Gijs Buntsma | 6-3,6-1 |
| ITF Germany F8 | 2015/07/22 10:00 | Julian Onken v Jan Choinski | 6-7,2-6 |
| ITF Germany F8 | 2015/07/21 10:30 | Julian Onken v Goncalo Oliveira | 6-4,6-1 |
| ITF Germany F8 Qual | 2015/07/19 08:30 | Julian Onken v Aliaksandr Prudnikau | 6-3,6-3 |
| ITF Germany F7 | 2015/07/15 09:00 | Leon Schutt v Julian Onken | 6-3,6-4 |
| ITF Germany F7 | 2015/07/13 08:00 | Leon Schutt v Julian Onken | 6-1,4-6,7-6 |
| ITF Germany F7 | 2015/07/13 08:00 | Jannik Rother v Julian Onken | 3-6,6-3,0-6 |
| ITF Germany F7 | 2015/07/12 08:00 | Egill Sigurdsson v Julian Onken | 1-6,1-6 |
| ITF Germany F4 | 2015/01/26 11:30 | Sander Arends v Julian Onken | 6-1,6-3 |